1232161621 has 2 divisors, whose sum is σ = 1232161622. Its totient is φ = 1232161620.

The previous prime is 1232161613. The next prime is 1232161639. The reversal of 1232161621 is 1261612321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1231027396 + 1134225 = 35086^2 + 1065^2 .

It is a cyclic number.

It is not a de Polignac number, because 1232161621 - 2³ = 1232161613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1232161421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 616080810 + 616080811.

It is an arithmetic number, because the mean of its divisors is an integer number (616080811).

Almost surely, 2^1232161621 is an apocalyptic number.

It is an amenable number.

1232161621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1232161621 is an equidigital number, since it uses as much as digits as its factorization.

1232161621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

The square root of 1232161621 is about 35102.1597768570. The cubic root of 1232161621 is about 1072.0685581780.

Adding to 1232161621 its reverse (1261612321), we get a palindrome (2493773942).

The spelling of 1232161621 in words is "one billion, two hundred thirty-two million, one hundred sixty-one thousand, six hundred twenty-one".